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The Japanese Macaca monkey has been studied in the wild for over 50 years. In 1952, on one small Japanese island, scientists dropped some 36 dirt for the monkeys. The monkeys liked their taste, but they found the dirt 37 .
One clever 18-month-old monkey 38 the problem by washing the sweet potatoes in a nearby river, She taught this to her mother. Her 39 also learned this new way and they taught their mothers too.
All the younger monkeys 40 learned to wash the dirty sweet potatoes to make them 40 to eat. But many found it very hard to learn this and still ate the 42 sweet optatoes.
Then something very 43 . In the autumn of 1958, scientists found that the monkeys on other nearby 44 began washing their sweet potatoes too. Scientists still don’t fully understand how this knowledge was 45 from one island to another.
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查看习题详情和答案>>完形填空 (共10小题;每小题1分,计10分)
Do you have a beautiful dream?I know almost everyone ___1____ his own dream in his life.The dreams are very important ___2_ them. The dreams can make them___3__ harder.
I am studying in a school now. My dream is ___4___ a teacher in west China. Many children there want to go to school____5____they can't. Their families are poor and their parents don't have enough money___6___ their children to school. I think that going to school and studying is the only __7__to change their life.
Teachers are greatly needed there, so I want to be a teacher to help them. I will be kind to my students and make __8___with them. I will give them love and teach them 9____ to be a useful person. I think it is an interesting job in the world. I hope my dream can ____10____!
1. A.has B.have C.is D.are
2. A.at B.to C.in D.with
3. A.to work B.to study C.work D.study
4. A.be B.to make C.to do D.to be
5. A.and B.but C.or D.so
6. A.to send B.sending C.to make D.making
7. A.way B.dream C.school D.place
8. A.friends B.a friend C.models D.a model
9. A.when B.why C.how D.what
10. A.find B.realize C.look for D.come true
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